Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598 A
• ◆ V.A.G 1598/11

Installation position => Installation position overview - Page 24-5

Notes:

• ◆ The throttle valve potentiometer (G69) informs the engine control unit of the position of the throttle valve.
• ◆ Checking function=> Reading measured value block display group 002, Page 01-62.
• ◆ After switching off ignition, engine control unit enters self-holding phase for 150 minutes. If repairs to throttle valve potentiometer are performed during this period, a fault may be stored in the fault memory.

Checking internal resistance

• ‒ Pull connector off throttle valve potentiometer.

• ‒ → Connect multimeter between contacts 1 and 2 to measure resistance.
• ‒ Specification: 1.5 ... 2.6 kω
• ‒ Connect multimeter between contacts 2 and 3 to measure resistance.
• ‒ Specification: 0.75 ... 1.3 kω

• ‒ Slowly move the throttle valve lever to full throttle position.
• ‒ Specification: Increasing resistance up to max. 3.6 kω

If a specification is not met:

• ‒ Replace throttle valve potentiometer.

Checking power supply

• ‒ Pull connector off throttle valve potentiometer.
• ‒ Switch on ignition.

• ‒ → Connect multimeter between contacts 1 and 2 to measure resistance.
• ‒ Specification: 4.5 ... 5.5 V
• ‒ Connect multimeter between contacts 2 and 3 to measure resistance.
• ‒ Specification: 4.5 ... 5.5 V

If a specification is not met:

• ‒ → With the ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector C only of engine control unit (control unit remains disconnected) .

• ‒ → Check for open circuit and short to earth/positive or earth in the following wiring connections:

• ‒ Rectify any open/short circuit as necessary.

=> "Current Flow Diagrams, Electrical Fault Finding and Fitting Locations" binder

Note:

Only use gold-plated contacts when repairing the contacts in the plug connectors.

If the wiring is OK:

• ‒ Replace engine control unit => Page 24-12.